Petee hobler



P. HOBLER 8: E. G. GOOD.

Grinding-Mill.

No. 226,315. Patented April 6,1880.

WASHXNGTON D D UNITED STATES PATENT OFFICE.

PETER HOBLER, OF BATAVIA, AND EDWARD G. GOOD, OF CHICAGO, ILL, ASSIGNORS TO AMERICAN GRINDING MILL COMPANY, OF SAME PLACE.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 226,315, dated April 6, 1880.

Application filed August 11, 1879.

To all whom it may concern:

Be it known that we, PETER HOBLER, of Batavia, Illinois, and EDWARD G. GOOD, of Chicago, Cook county, State of Illinois, have invented a new and. useful Improvement in GrindingMills, of which the following is a full description, reference being had to the accompanying drawings, in which Figure 1 is a vertical section. Fig. 2 is a I0 top view Fig. 3, an inside view of the loose ring.

It is common to make grindingrings of cast metal, and to place them, for use, in vertical instead of horizontal planes. Heretofore the 1'5 runner or'movable grinding-ring has been rigidly secured upon a shaft, and only one adjustment has been provided for to adapt the mill to grind fine or coarse.

The object of 'our invention is to so construct the will that the movable grinding-ring, in

addition to being adjustable, so as to grind' fine or coarse, will have such freedom of movement while grinding that its face will be, from time to time, automatically adjusted relatively to the face of the fixed grinding-ring, as circumstances may require; and this we accomplish by connecting the grindin g-rin gloosely to the shaft which drives it, and so that such ring is free to move a little upon the end of such 0 shaft, so as to bring the grinding-surface nearer to or carry it farther from the fixed ring, and

by devices for adjusting the runner so as to grind fine or coarse, as hereinafter fully described.

Another object of our invention is to so construct the devices used to adjust the ring to grind fine or coarse that in case any small hard substance passes in between the rings the grinder can yield a little, and this we ac- 0 complish by the use of a spring in connection with the adjusting devices.

We have not shown a full mill, but only so much as is necessary to illustrate our invention.

In the drawings, A represents a fixed grinding-ring secured to a plate, 13, in the usual manner.

C is a movable grinding-ring placed loosely on the square or many-sided end a of a shaft,

\ D, which shaft is supported in suitable bearings, as usual, which are not shown, and such shaft is to be driven in any known suitable manner. As shown, the inner end of the opening in the ring C which receives the end a of the shaft is considerably larger than the outer end, which first receives the shaft. This is not a necessity, but it is desirable, permitting greater freedom of movement of the ring C.

By placing the runner C loosely on its shaft, as described, it can be rotated by the shaft and yet have, to a certain extent, the freedom of movement of a ball-and-socket or other universal joint. This ring is made quite thick at the center to provide a chamber for the end of the shaft D, and upon the outer face and centrally located is an extension, F, which passes loosely through the case E, which incloses the rings, to avoid friction and wear, but sufficiently close to prevent the runner from tipping too far.

G is a bridge-tree, hinged at one end, I), to the case E. The other end passes over a screw-threaded rod, 0, secured to the case E.

d is a hand-wheel and nut on c, and c is a rubber or other suitable spring upon 0, and between the end of the bar G and the handwheel d. f is a projection or stud on the iiiside of the bar G, so arranged that it comes in contact with the end of the projection F on the runner C. y is an oilcup. H indicates the metal case surrounding the runner, and a an opening in the runner inwardly enlarged.

The hopper is not shown,but can be made as usual. The arrow it indicates the course of the grain to the rings, and the arrow 2' is in the exit-passage.

The operation is as follows While the runner C is in motion it is free to adjust itself relatively to the face of the fixed ring A, because its connection with the end of its drivingshaft is practically a universal joint. This is desirable for at least two reasons: first, because in casting the rings they are'likely to have faces which are not exactly true, and if the runner is rigidly secured to its driving- 5 shaft the grinding will be uneven and the rings will be likely to come in contact with each other at some point when set for fine grinding; and, second, it is desirable in order to permit the runner to yield a little upon one side to accommodate itself to any small foreign substance which may pass into the mill.

We are aware that it is not new to place a runner or grindin g-rin g suffioiently loose upon its driving-shaft to permit an end adjustment thereon; but we are not aware that such a runner has been cut away, so that at the point of connection with the driving-shaft a tipping 20 jection F and holds the runner to its place,

and by means of the hand-wheel the runner can be adjusted to grind fine or coarse. The adjustment is to be such that the spring 6 will not yield under ordinary conditions; but if a piece of metal or other hard substance passes in between the rings the spring 6 can yield somewhat to relieve the mill.

What we claim as new, and desire to secure by Letters Patent, is as follows:

1. The movable grinding ring or runner G, having the circular projection F and the angular opening a, enlarged at its'inner end, in combination with the shaft D, having an angular end, a, whereby said grinding-ring, in addition to the ordinary adjustment, is permitted to vibrate or shift its vertical position, substantially as specified.

2. The free adjusting-bearingf, in combination with the runner 0, having the extension F, and the arm G, hinged to the case, spring 6, adjusting-nut d,'and screw 0, attached to the case, whereby the mill is reduced to a more compact form, and the end of the runner is permitted to play across the end bearing, substantially as and for the purposes described.

PETER HOBLER. EDWARD G. GOOD.

Witnesses:

E. A. Wns'r, JOHN C. POLLEY, Jr. 

